1992 Jeep Wrangler no spark

  • 6 CYL
  • 4WD
  • 139,997 MILES
Will not start! Fairly new engine installed recently new crank sensor, new pickup distrib, new computer, new cap, new wires, new roter what else can we do?
Do you
have the same problem?
Tuesday, June 3rd, 2008 AT 7:39 PM

1 Reply

How do you know you have no spark? Are you certain this is the problem or could it be something else not causing the vehicle to start?

Did you prime the engine? Do you have oil pressure? Did you open up the engine to do that crank sensor? Not positive about that sensors location is all. I have a 4 cyl not a 6.

Couple things to check - depending on how long it took you to fix everything. If you took the oil pan off to work on the crank. Did you disturb the oil pump? It might need to be primed up again. To do this, crank the engine with the plug wires. Unplugged - until you get oil pressure reading on the gauge. (Or you can pull the distributor and using a long flathead screwdriver in the hole, spin the oil pump counter clockwise for about 5 mins with a corder power drill - to remove the air from the oil system, and prime the pump)

The next thing it might be - depending on how long the repair work took you. Oil in the cylinders? If the repair work took a long time, then it is possible the oil slowly dripped and dried out in the cylinders. To fix this, you need to squirt some oil into the cylinders at the spark plug holes. (Not a lot, just enough to lube the cylinder walls) work the cylinders up and down manually - by hand cranking the engine a few times. This should restore compression to the cylinders. Although before you go to that effort - check the compression using a gauge on each cylinder. It might only be one of them, or none at all.

After all that - I would double check the ground wires for those new components - it's an old jeep - probably has some dirty / rusty components under that hood - mine does. Verify all the contacts are good.

(Oh and this is really a long shot but happened to me. Check the ground wire from the battery to the nearby firewall. The bolt for mine was rusty and wiggling the wire got mine to run. Turned out for me to just be a faulty ground wire)
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Sunday, June 8th, 2008 AT 5:30 PM

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